水铁矿负载甘蔗渣吸附磷酸根开放性综合化学实验

doi:10.3866/PKU.DXHX202006044

Abstract

Abstract:

Ferrihydrite loaded sugarcane bagasse composite adsorbent with good adsorption performances for phosphate was prepared by in situ precipitation. The adsorbent was characterized by field emission scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD) and Zeta potential. Adsorption behavior and mechanism of phosphate on the composite adsorbent were investigated. Results showed that the adsorption capacity of bagasse increased significantly after loaded with ferrihydrite, and equilibrium reached within 30 min. Adsorption isotherm and kinetics of phosphate on the composite adsorbents could be predicted well by the Langmuir and pseudo-second-order model, respectively. Practical waste water treatment showed that 99.8% of phosphate could be removed from aqueous solution. This research content could be used as a comprehensive experiment for industrial analysis, applied chemistry and environmental engineering majors. It could improve students' study interesting, develop their capability to apply knowledge, and stimulate their innovation ability.

Key words: Comprehensive chemistry experiment, Sugarcane bagasse, Loaded, Ferrihydrite, Adsorption, Phosphate

Junxia Yu, Ruyi Zhou, Ruan Chi. A Comprehensive Chemistry Experiment on the Adsorption of Phosphate by Ferrihydrite Loaded Sugarcane Bagasse[J].University Chemistry, 2021, 36(6): 2006044.

Figures/Tables 6

References 16

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模型	Langmuir模型			Freundlich模型			Temkin模型
参数	K_L/	q_m/	R²	K_F/	1/n	R²	A_T/	b_T/	R²
参数	(L∙mg^-1)	(mg∙g^-1)	R²	(mg∙mg^-1/n∙L^1/n∙g^-1)	1/n	R²	(L∙mg^-1)	(J∙mol^-1)	R²
负载甘蔗渣	0.27	81.2	0.993	44.0	0.13	0.977	62.7	267	0.977
甘蔗渣	0.11	0.038	0.940	0.01	0.28	0.706	1	1	0.901

模型	准一级模型 Pseudo-first-order model			准二级模型Pseudo-second-order model			颗粒内扩散模型 Intra-particle-diffusion model
参数	k₁/min^-1	q_e/(mg∙g^-1)	R²	k₂/(g∙mg^-1∙min^-1)	q_e/(mg∙g^-1)	R²	K_i/(mg∙g^-1∙min^-1/2)	I/(mg∙g^-1)	R²
负载甘蔗渣	0.86	57.7	0.992	0.78	59.2	0.999	1.84	43.2	0.535
甘蔗渣	0.05	0.033	0.951	15.5	0.039	0.951	0.003	0.007	0.861

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A Comprehensive Chemistry Experiment on the Adsorption of Phosphate by Ferrihydrite Loaded Sugarcane Bagasse

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